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AWS has expanded its IPv6 support, enabling AWS Lambda to handle inbound IPv6 connectivity via AWS PrivateLink. This enhancement allows for private, secure communication with Lambda functions using IPv6 or dual-stack (IPv4 and IPv6) configurations.
Read more: AWS Lambda IPv6 Support
You Should Know:
1. Verify IPv6 Support in AWS Lambda
To check if your Lambda function supports IPv6, use the AWS CLI:
aws lambda get-function --function-name YourFunctionName --query 'Configuration.VpcConfig.IpV6Allowed'
If the output is true, your function is IPv6-enabled.
2. Configure a Dual-Stack VPC for Lambda
Ensure your VPC supports IPv6:
aws ec2 describe-vpcs --vpc-id YOUR_VPC_ID --query 'Vpcs[].Ipv6CidrBlockAssociationSet[].Ipv6CidrBlock'
If no IPv6 CIDR is attached, associate one:
aws ec2 associate-vpc-cidr-block --vpc-id YOUR_VPC_ID --amazon-provided-ipv6-cidr-block
3. Update Lambda’s VPC Configuration
Modify your Lambda function to allow IPv6:
aws lambda update-function-configuration \ --function-name YourFunctionName \ --vpc-config SubnetIds=subnet-123,subnet-456,SecurityGroupIds=sg-789,IpV6Allowed=true
4. Test IPv6 Connectivity
Use `curl` to test IPv6 connectivity to your Lambda via PrivateLink:
curl -6 "https://YOUR_LAMBDA_ENDPOINT" --header "Host: YOUR_INTERNAL_DNS"
5. Monitor IPv6 Traffic
Check IPv6 traffic logs in CloudWatch:
aws logs filter-log-events \ --log-group-name "/aws/lambda/YourFunctionName" \ --filter-pattern '"ipv6"'
What Undercode Say:
IPv6 adoption is critical for modern cloud infrastructure due to IPv4 exhaustion. AWS Lambda’s new IPv6 support via PrivateLink enhances scalability and security. Below are additional Linux and Windows networking commands for IPv6 troubleshooting:
Linux IPv6 Commands:
- Check IPv6 address assignment:
ip -6 addr show
- Test IPv6 connectivity:
ping6 google.com
- Disable IPv6 temporarily:
sysctl -w net.ipv6.conf.all.disable_ipv6=1
Windows IPv6 Commands:
- List IPv6 addresses:
Get-NetIPAddress -AddressFamily IPv6
- Force IPv6 DNS resolution:
Resolve-DnsName example.com -Type AAAA
For hybrid cloud setups, ensure your on-premises routers support IPv6 BGP peering with AWS Direct Connect.
Expected Output:
A fully functional IPv6-enabled AWS Lambda function accessible via PrivateLink, verified through CLI commands and network tests.
Reference: AWS IPv6 Documentation
References:
Reported By: Darryl Ruggles – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
